What if there was a black hole in your pocket?

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What would happen to you if a black hole the size of a coin suddenly appeared near you? Short answer: you’d die. Long answer: it depends. Is it a black hole with the mass of a coin, or is it as wide as a coin? Suppose a US nickel with the mass of about 5 grams magically collapsed into a black hole. This black hole would have a radius of about 10 to the power of −30 meters. By comparison, a hydrogen atom is about 10 to the power of −11 meters. So the black hole compared to an atom is as small as an atom compared to the Sun. Unimaginably small! And a small black hole would also have an unimaginably short lifetime to decay by Hawking radiation. It would radiate away what little mass it has in 10 to the power of −23 seconds. Its 5 grams of mass will be converted to 450 terajoules of energy, which will lead to an explosion roughly 3 times bigger than the atomic bombs dropped on Hiroshima and Nagasaki combined. In this case, you die. You also lose the coin. If the black hole had the diameter of a common coin, then it would be considerably more massive. In fact, a black hole with the diameter of a nickel would be slightly more massive than the Earth. It would have a surface gravity a billion billion times greater than our planet currently does. Its tidal forces on you would be so strong that they’d rip your individual cells apart. The black hole would consume you before you even realized what’s happening. Although the laws of gravity are still the same, the phenomenon of gravity that you’d experience would be very different around such dense objects. The range of the gravitational attraction extends over the entire observable universe, with gravity getting weaker the farther away you are from something. On Earth right now, your head and your toes are approximately the same distance from the center of our planet. But if you stood on a nickel-sized black hole, your feet would be hundreds of times closer to the center, and the gravitational force would be tens of thousands of times as large as the force on your head and rip you into a billion pieces. But the black hole wouldn’t stop with just you. The black hole is now a dominant gravitational piece of the Earth–Moon–Black-Hole-of-Death system. You might think that the black hole would sink towards the center of the planet and consume it from the inside out. In fact, the Earth also moves up onto the black hole and begins to bob around, as if it were orbiting the black hole, all while having swathes of mass eaten with each pass, which is much more creepy. As the Earth is eaten up from the inside, it collapses into a scattered disk of hot rock, surrounding the black hole in a tight orbit. The black hole slowly doubles its mass by the time it’s done feeding. The Moon’s orbit is now highly elliptical. The effects on the Solar system are awesome— in the Biblical sense of awesome, which means terrifying. Tidal forces from the black hole would probably disrupt the near-Earth asteroids, maybe even parts of the asteroid belt, sending rocks careening through the Solar system. Bombardment and impacts may become commonplace for the next few million years. The planets are slightly perturbed, but stay approximately in the same orbit. The black hole we used to call Earth will now continue on orbiting the Sun in the Earth’s place. In this case, you also die. This bonus video was made possible by your contributions on Patreon. Thank you so much for your support! The topic is based on a question on the AskScience subreddit and the glorious answer by Matt [Caplin?], who also worked with us on this video. Check out his blog, Quarks and Coffee, for more awesome stuff like this! If you want to discuss the video, we have our own subreddit now. To learn more about black holes or equally interesting neutron stars, click here. Subtitles by the Amara.org community
Channel: Kurzgesagt – In a Nutshell
Views: 8,925,490
Rating: 4.952529 out of 5
Keywords: black hole, destruction, gravity, what if, black hole sun, universe, sun, planet, facts, Space, milky way, center, wormhole, eating a star, forming, explained, collision, creation, consuming, cosmos, 2015, destroying, star, eats, event horizon, schwarzschild radius, experiment, footage, after effects, interstellar, killing, mass, paradox, quasar, simulation, time travel, stephen hawking, theory, vs, weapon, funny, supermassive, documentary, earth, flat design, infographic, animation, kurzgesagt, in a nutshell
Channel Id: undefined
Length: 3min 38sec (218 seconds)
Published: Thu Jul 16 2015
Reddit Comments

This was a thread on reddit.

👍︎︎ 269 👤︎︎ u/bamboodia 📅︎︎ Jul 16 2015 🗫︎ replies

Question. If a micro black hole evaporates it exploades with that much energy? I got the understanding during the CERN LHC scare that "if a black hole is created it will be so small and insignificant it will just evaporate instantly" and we all felt much better about it.

👍︎︎ 72 👤︎︎ u/iTIILC 📅︎︎ Jul 16 2015 🗫︎ replies

So if I'm hearing him right... death by black hole is a pretty quick way to go.

👍︎︎ 53 👤︎︎ u/StopReadingMyUser 📅︎︎ Jul 16 2015 🗫︎ replies

And that's just a black hole the size of a nickel. Meanwhile...

👍︎︎ 9 👤︎︎ u/auxiliary-character 📅︎︎ Jul 16 2015 🗫︎ replies

Why haven't we weaponized tiny black holes yet?

👍︎︎ 24 👤︎︎ u/[deleted] 📅︎︎ Jul 16 2015 🗫︎ replies

What makes a black hole have mass?

👍︎︎ 6 👤︎︎ u/iMasterX 📅︎︎ Jul 16 2015 🗫︎ replies

I miss when reddit used to be about cool shit like this, instead of circlejerking about feminists.

👍︎︎ 166 👤︎︎ u/HarryBlessKnapp 📅︎︎ Jul 16 2015 🗫︎ replies

Tardis, ha

👍︎︎ 34 👤︎︎ u/[deleted] 📅︎︎ Jul 16 2015 🗫︎ replies

stupid question: Where does all this mass "go"?

👍︎︎ 5 👤︎︎ u/Bpesca 📅︎︎ Jul 16 2015 🗫︎ replies
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